<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button id="btn">打印中</button>
    <script src="/socket.io/socket.io.js"></script>
    <script>
        let isPrint=true
        let btn=document.getElementById('btn')
        btn.addEventListener('click',()=>{
            isPrint=!isPrint
            btn.innerText=isPrint?'打印中':"不打印"
        })
        var socket=io()
        socket.on('message',data=>{
            if(isPrint){
                console.log(data)
            }
            
        })
        
    </script>
</body>
</html>